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Results tagged with geometry
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user 99589
(1) abstract geometry; (2) storing geographic data in projected coordinates; (3) a generic ESRI term for vector features; a class for "geometry" objects.
1
vote
1
answer
2k
views
Difference between notations of WKT format: 'POINT()' and 'Point ()'
After reviewing this thread Adding field with geometry in WKT format in QGIS I started to wonder about the difference between the WKT notations: 'POINT(276547.16725324 5477265.87268898)' and 'Point (276547.16725324 … 5477265.87268898)' of the same vector geometry object. …
- 34k
4
votes
Passing Geometry object to processing tool instead of Layer
So, it seems there is no possibility to pass directly the geometry object to processing algorithm. … SELECT ST_GeomFromText('{difference_geometry.asWkt()}')", "result", "virtual" )
QgsProject.instance().addMapLayer(result)
References:
Creating Virtual Layer programmatically in QGIS
Visualising WKT geometry …
- 34k
4
votes
Merging layers with different geometry (PointZ and MultiLineStringZ) in QGIS
No, because "QGIS does not support GeometryCollection as a valid geometry type."
You can not merge layers with "Merge vector layers", but you can package them with "Package layers". … References:
QGIS does not show the Geometry Collection Polygons from JSON file
Opening GeoJSON file with mixed geometries in QGIS? …
- 34k
2
votes
Accepted
SQL Query error: ambiguous column name geometry
In my opinion you do not need any SRID because you are not working with ST_Length_Spheroid().
What @she_weeds is pointing on is indeed correct.
SELECT ws."Network", count(ws."Network"), sum(st_leng …
- 34k
3
votes
Accepted
Display point with heighest value in group of points
Perhaps, you will find this expression suitable for you:
geometry_n(
collect(
expression:=$geometry,
group_by:=substr("NumeroNom", 0, 5),
filter:="AmslFt"=maximum("AmslFt", …
- 34k
4
votes
Accepted
Converting QgsPoint() to QgsGeometry() and vice versa with PyQGIS
TLTR;
from qgis.core import QgsPoint, QgsGeometry
# QgsPoint -> QgsGeometry
point_as_geom = QgsGeometry(QgsPoint(10, 20, 5, 1))
# QgsGeometry -> QgsPoint
geom_as_point = point_as_geom.constGet()
Af …
- 34k
5
votes
Searching for values in different layers without nested for loops using PyQGIS
Referring to a single feature
The getFeature() method of the QgsVectorLayer class works as following:
QgsFeature QgsVectorLayer::getFeature(QgsFeatureId fid) const
Queries the layer for the feature …
- 34k
18
votes
Visualising WKT geometry string in QGIS
ST_GeomFromText('{wkt_string}')", "result", "virtual")
if layer.isValid():
QgsProject.instance().addMapLayer(layer)
References:
PostGIS | ST_GeomFromText
Wikipedia | Well-known text representation of geometry …
- 34k
8
votes
Accepted
Merging lines (with and with no overlaps) in QGIS
In Expression dialogue execute the following expression
CASE
WHEN sum(num_geometries($geometry), group_by:= geom_to_wkt($geometry)) > 1 THEN 'Y'
ELSE 'N'
END
'Y' will give you all … If there is a difference in any part of the geometry, this expression fails to match them. …
- 34k
1
vote
Creating heat map based on attribute from another layer in QGIS
Duplicate your layer via RMC > Duplicate Layer.
When applying a change to the original layer
also the duplicated one will be updated
- 34k
1
vote
Changing orientation of all polygons at once with numeric value in QGIS
SELECT "id", rotate(geometry, 45) AS geom
FROM "polygon"
The output point layer with its attribute table will look like
It rotates geometry clockwise about the center of the original geometry’s bounding …
- 34k
1
vote
Save line geometry as points geometry using PyQGIS
@sweet.sugar.cola answered to her own question
From one of the answers, I found a solution. The code below do exactly
what I wanted.
lakes=[]
lineFeatures = [feat for feat in lines.getFeatures()]
po …
- 34k
0
votes
Deleting duplicate geometry in PostGIS tables
@MAP answered to his own question:
I finally found an easy way, which is working in my case:
DELETE FROM planet_osm_point
WHERE ctid NOT IN (
SELECT max(ctid)
FROM planet_osm …
- 34k
1
vote
Mass editing of polygon vertices in shapefile in QGIS
There are probably better solutions (that will be provided), nevertheless, I am giving IMHO the most intuitive approach
Step 1. Extract coordinates from polygon vertices, follow any of the suggested s …
- 34k
5
votes
What is "Fix geometries" tool actually doing in QGIS?
From the QGIS Documetation:
Attempts to create a valid representation of a given invalid geometry
without losing any of the input vertices. … Always outputs multi-geometry
layer.
More details you can find in:
qgsalgorithmfixgeometries.h
qgsalgorithmfixgeometries.cpp
References:
GitHub/QGIS/src/analysis/processing/ …
- 34k